JP2013133275A - Slag stimulant and ≡ slag hydraulic composition - Google Patents
Slag stimulant and ≡ slag hydraulic composition Download PDFInfo
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
Description
本発明は、水硬性物質中のスラグ置換率が５０質量％以上である≡スラグ水硬性組成物の高強度化に関する。 The present invention relates to increasing the strength of a ≡slag hydraulic composition having a slag substitution rate of 50% by mass or more in a hydraulic substance.
モルタルやコンクリートなどの水硬性組成物において、環境負荷低減等の理由から一般に製造時の二酸化炭素発生が少ないスラグ粉をセメントの代替物として、より高い割合で使用することが検討されている。しかしながら、セメント代替物としてのスラグ粉の使用量を増すと、水硬性組成物の凝結・硬化遅延や強度低下を起こす。このため、セメントをスラグ粉に置換できる割合は制限があり、一般のモルタルやコンクリートでは、スラグ粉への置換可能量はセメント量のおよそ５０質量％未満である。（例えば、特許文献１参照。）また、高強度コンクリートでは、セメントからスラグ粉への置換比率が僅かであっても、所定の強度到達が難しくなるため、結合相形成材料をセメントからスラグ粉にする材料転換が進まない状況になっている。 In hydraulic compositions such as mortar and concrete, it has been studied to use slag powder, which generates less carbon dioxide during production, as a substitute for cement in a higher proportion for reasons such as reducing environmental impact. However, when the amount of slag powder used as a cement substitute is increased, the setting / setting delay and the strength of the hydraulic composition are reduced. For this reason, the ratio which can substitute cement with slag powder has a restriction | limiting, and in general mortar and concrete, the amount which can be substituted to slag powder is less than about 50 mass% of cement amount. (For example, refer to Patent Document 1.) Further, in high-strength concrete, even if the substitution ratio from cement to slag powder is small, it is difficult to reach a predetermined strength, so the binder phase forming material is changed from cement to slag powder. The situation is that the material change is not progressing.
ポルトランドセメントの一部をスラグ粉で置換した水硬性組成物において、セメントの５０質量％以上をスラグ粉に置換した≡スラグ水硬性組成物でも顕著な凝結及び硬化の遅延を起こさずに、高い強度発現性が容易に得られるスラグ刺激剤の提供及び高強度コンクリートとしての基準を満足するような高い強度の≡スラグ水硬性組成物の提供を課題とする。 A hydraulic composition in which part of Portland cement has been replaced with slag powder. Even when ≡slag hydraulic composition in which 50% by mass or more of the cement has been replaced with slag powder, high strength without causing significant setting and hardening delays. It is an object of the present invention to provide a slag stimulating agent that can be easily obtained and to provide a high-strength ≡slag hydraulic composition that satisfies the standard as high-strength concrete.
本発明者は、前記課題解決のため鋭意検討した結果、潜在水硬性物質であるスラグ粉を特定物質で刺激すれば、スラグ粉に普通ポルトランドセメントに匹敵する水和反応活性を付与することができ、その結果、セメントを大量のスラグ粉で置換しても普通ポルトランドセメントを使用した時に近い水和特性や凝結性が見られ、普通ポルトランドセメント使用時並の高い強度発現性が得られることを見出し、本発明を完成させた。 As a result of intensive investigations for solving the above problems, the present inventor can impart hydration reaction activity comparable to that of ordinary Portland cement to slag powder by stimulating slag powder, which is a latent hydraulic substance, with a specific substance. As a result, even if the cement is replaced with a large amount of slag powder, hydration characteristics and cohesiveness similar to those when ordinary Portland cement is used can be seen, and it is found that high strength development can be obtained as when ordinary Portland cement is used. The present invention has been completed.
即ち、本発明は、次の（１）〜（２）で表されるスラグ刺激剤、（３）で表される≡スラグ水硬性組成物である。（１）β型半水石膏（Ｅ）と無水石膏（Ｆ）を質量比（Ｅ／Ｆ）＝０．３〜１で含有するスラグ刺激剤。（２）スラグ粉１００質量部に対し、４〜１０質量部添加する前記（１）のスラグ刺激剤。（３）前記（１）又は（２）のスラグ刺激剤４〜１０質量部、ポルトランドセメントクリンカ粉砕物２０〜１００質量部及びスラグ粉１００質量部を含有する≡スラグ水硬性組成物。 That is, the present invention is a slag stimulating agent represented by the following (1) to (2) and an ≡slag hydraulic composition represented by (3). (1) A slag stimulant containing β-type hemihydrate gypsum (E) and anhydrous gypsum (F) at a mass ratio (E / F) = 0.3-1. (2) The slag stimulant according to (1), wherein 4 to 10 parts by mass are added to 100 parts by mass of slag powder. (3) A ≡slag hydraulic composition containing 4 to 10 parts by mass of the slag stimulant of (1) or (2), 20 to 100 parts by mass of a Portland cement clinker pulverized product, and 100 parts by mass of slag powder.
本発明のスラグ刺激剤を用いることによってモルタルやコンクリート等の水硬性組成物中の水硬性物質としてのスラグ使用量を飛躍的に高めることが可能になる為、セメントのスラグへの置換割合を増大することによって、水硬性組成物製造に伴って排出される二酸化炭総量を、従来よりも大幅に低減できる可能性がある。また、スラグ粉含有量が多い水硬性組成物はアルカリ骨材反応抑制効果、酸や塩害に対する高い抵抗性などの化学的耐久性を具備しているが、本発明のスラグ刺激剤を用いることにより、さらに強度的にも高い組成物になり得ることから、総じて耐久性の高い水硬性組成物を容易に得ることができる。 By using the slag stimulating agent of the present invention, it becomes possible to dramatically increase the amount of slag used as a hydraulic substance in hydraulic compositions such as mortar and concrete, thereby increasing the replacement ratio of cement to slag. By doing so, there is a possibility that the total amount of carbon dioxide discharged along with the production of the hydraulic composition can be significantly reduced as compared with the conventional case. In addition, the hydraulic composition having a high slag powder content has an alkaline aggregate reaction inhibitory effect and chemical durability such as high resistance to acid and salt damage, but by using the slag stimulating agent of the present invention. Moreover, since it can be a composition having high strength, a hydraulic composition having high durability as a whole can be easily obtained.
本発明のスラグ刺激剤に含有する無水石膏は、何れのものでも良く、例えばＩＩ型無水石膏、ＩＩＩα型無水石膏、ＩＩＩβ型無水石膏を挙げることができる。好ましくは、入手の容易性やスラグに対する刺激作用の安定発現性の点等から、ＩＩ型の無水石膏とする。無水石膏の使用は注水以降長期に渡って硫酸イオンが徐々に溶解放出され続けることから、中長期段階におけるスラグへの刺激作用を付与し、刺激作用の長期持続性に貢献する。このことにより中長期の段階においてもスラグが水硬性物質としての機能を十分発現することが可能となり、よって該段階での≡スラグ水硬性組成物の強度発現性向上がはかれる。 The anhydrous gypsum contained in the slag stimulating agent of the present invention may be any one, and examples thereof include II type anhydrous gypsum, IIIα type anhydrous gypsum, and IIIβ type anhydrous gypsum. Preferably, it is made from type II anhydrous gypsum from the viewpoint of easy availability and stable expression of stimulating action on slag. Since anhydrous gypsum continues to dissolve and release sulfate ions gradually over a long period of time after water injection, it gives a stimulating action to slag in the medium to long-term stage and contributes to the long-term persistence of the stimulating action. This makes it possible for the slag to sufficiently exhibit the function as a hydraulic substance even in the medium to long-term stage, and therefore, the strength development of the ≡slag hydraulic composition can be improved in this stage.
本発明の速硬剤の含有成分であるβ型半水石膏は、石膏類（半水石膏、二水石膏及び無水石膏）の結晶の中でも水への溶解速度が最も早いものであり、注水後にいち早く硫酸イオンを放出する。このことから、注水直後からの初期におけるスラグへの強い刺激作用を付与し、他の結晶構造の石膏類では特に初期段階で不足する硫酸イオン放出量を補い、初期段階からスラグが水硬性物質として十分機能するようにせしめることができる。注水後の初期段階で水和反応性が付与されるスラグ粉は、例えば同質量の普通ポルトランドセメントの初期段階で見られる水和反応活性よりも強い水和反応活性を呈し、水硬性物質が普通ポルトランドセメントのみの水硬性組成物よりも高い初期強度の発現が可能である。本発明で使用するβ型半水石膏は、特に限定されるものではなく、何れのものでも使用できる。好ましくは、注水後の溶解し易さの点（下限域）及び風化による変質防止の点（上限域）から、粒度がブレーン比表面積で１５００〜８５００ｃｍ2／ｇの半水石膏の使用が推奨される。 The β-type hemihydrate gypsum, which is a component of the quick hardening agent of the present invention, has the fastest dissolution rate in water among the crystals of gypsum (semihydrate gypsum, dihydrate gypsum, and anhydrous gypsum). Releases sulfate ions quickly. This gives a strong stimulating effect on the slag immediately after water injection, and supplements the amount of sulfate ion release that is lacking in the initial stage, especially in gypsum with other crystal structures. From the initial stage, the slag becomes a hydraulic substance. It can be made to function well. Slag powder to which hydration reactivity is imparted in the initial stage after water injection exhibits a hydration reaction activity stronger than the hydration reaction activity seen in the initial stage of ordinary Portland cement of the same mass, for example. Higher initial strength than the hydraulic composition of only Portland cement is possible. The β-type hemihydrate gypsum used in the present invention is not particularly limited, and any type can be used. Preferably, it is recommended to use hemihydrate gypsum with a grain size of 1500-8500 cm 2 / g in terms of Blaine specific surface area from the viewpoint of ease of dissolution after water pouring (lower limit area) and prevention of deterioration due to weathering (upper limit area). The
前述の通り、本発明のスラグ刺激剤は、注水初期においてはβ型半水石膏、中長期においては無水石膏がそれぞれ主体的に潜在水硬性物質たるスラグ粉を刺激し、もって該スラグ粉に水和反応活性を注水以降持続的に発現せしめさせたものである。このような刺激作用を安定して持続的に付与する為、本発明のスラグ刺激剤は、β型半水石膏（Ｅ）と無水石膏（Ｆ）を質量比（Ｅ／Ｆ）＝０．３〜１で含有したものとする。質量比（Ｅ／Ｆ）が０．３未満では初期強度発現性が著しく低いものとなることがあるので好ましくなく、また、質量比（Ｅ／Ｆ）が１以上ではエトリンガイトが注水初期段階で大量に生成して過膨張を起こしたり、結晶水が過多になり水分量の増大に伴って強度発現性が向上し難くなることがあるので好ましく無い。本発明のスラグ刺激剤は、β型半水石膏と無水石膏以外の成分も本発明の効果を実質的に喪失させるものでない限り、含有することは可能である。 As described above, in the slag stimulating agent of the present invention, β-type hemihydrate gypsum in the initial stage of water injection and anhydrous gypsum in the medium to long term mainly stimulate slag powder, which is a latent hydraulic substance. The reaction activity is continuously expressed after water injection. In order to provide such a stimulating action stably and continuously, the slag stimulating agent of the present invention comprises β-type hemihydrate gypsum (E) and anhydrous gypsum (F) in a mass ratio (E / F) = 0.3. It shall be contained in ~ 1. If the mass ratio (E / F) is less than 0.3, the initial strength development may be extremely low, which is not preferable. If the mass ratio (E / F) is 1 or more, a large amount of ettringite is present in the initial stage of water injection. This is not preferable because it may cause excessive expansion and may cause excessive expansion of crystal water or increase the amount of water, which makes it difficult to improve strength development. The slag stimulating agent of the present invention can contain components other than β-type hemihydrate gypsum and anhydrous gypsum as long as the effects of the present invention are not substantially lost.
また、本発明のスラグ刺激剤は、スラグ粉１００質量部に対し、４〜１０質量部添加されるのが好ましい。４質量部未満の添加ではスラグが十分刺激されず、強度発現性が向上しないことがあるので好ましくない。また、１０質量部を超える添加では、スラグの刺激に寄与しない石膏量が増大するため、水硬性組成物への凝結性の障害となったり、低温時には過膨張化を起こす虞がある。 Moreover, it is preferable that 4-10 mass parts of slag stimulating agents of this invention are added with respect to 100 mass parts of slag powder. Addition of less than 4 parts by mass is not preferable because slag is not sufficiently stimulated and strength development may not be improved. Moreover, since the amount of gypsum which does not contribute to the irritation | stimulation of slag will increase when it exceeds 10 mass parts, there exists a possibility that it may become the disorder | damage | failure of the setting property to a hydraulic composition, or may cause an overexpansion at low temperature.
また、本発明は、前述の本発明によるスラグ刺激剤４〜１０質量部、ポルトランドセメントクリンカ粉砕物２０〜１００質量部及びスラグ粉１００質量部を含有する≡スラグ水硬性組成物である。 The present invention is also a ≡slag hydraulic composition containing 4 to 10 parts by mass of the slag stimulating agent according to the present invention, 20 to 100 parts by mass of a Portland cement clinker pulverized product, and 100 parts by mass of slag powder.
本発明の≡スラグ水硬性組成物に含有使用できるポルトランドセメントクリンカ粉砕物は、何れのポルトランドセメントのクリンカ粉砕物であっても良い。具体的には、普通ポルトランドセメント、早強ポルトランドセメント、超早強ポルトランドセメント、中庸熱ポルトランドセメント及び低熱ポルトランドセメント等のクリンカ粉砕物を例示することができる。クリンカを製造する為の焼成温度や焼成装置は通常のポルトランドセメントクリンカ製造で行われているものと概ね同様であれば良く、特に限定されない。また、クリンカ粉砕物の粒度は制限されない。好ましくは、セメント粒子として水和反応活性が支障なく発現できること（下限域）並びに粉砕コストの高騰抑制の点（上限域）から、ブレーン比表面積が１５００〜８５００ｃｍ2／ｇの粉砕物とする。より好ましくは、ブレーン比表面積が２５００〜５０００ｃｍ2／ｇの粉砕物とする。尚、粉砕手段は特に限定されず、例えば、ボールミル、ピンミル、振動ミル等の粉砕機と、市販の分級装置や篩い等を用いて粉砕・整粒することができる。≡スラグ水硬性組成物中のポルトランドセメントクリンカ粉砕物の含有量は、スラグ粉含有量１００質量部に対し、２０〜１００質量部とする。２０質量部未満ではスラグ刺激剤を併用しても強度発現性が高くなり難く、中性化も起こし易くなるために好ましくない。また、１００質量部を超えるとアルカリ骨材反応等の化学的耐久性が低下し、さらには水硬性組成物製造に伴って排出される二酸化炭量を削減できなくなるので好ましくない。 The pulverized Portland cement clinker that can be used in the ≡slag hydraulic composition of the present invention may be a clinker pulverized product of any Portland cement. Specifically, clinker pulverized materials such as ordinary Portland cement, early-strength Portland cement, ultra-early strong Portland cement, medium heat Portland cement, and low heat Portland cement can be exemplified. The firing temperature and firing apparatus for producing the clinker are not particularly limited as long as they are substantially the same as those used in ordinary Portland cement clinker production. The particle size of the clinker pulverized product is not limited. Preferably, the pulverized product has a Blaine specific surface area of 1500 to 8500 cm 2 / g from the viewpoint that the hydration reaction activity can be expressed without difficulty as cement particles (lower limit range) and the suppression of the increase in grinding cost (upper limit range). More preferably, the pulverized product has a Blaine specific surface area of 2500 to 5000 cm 2 / g. The pulverizing means is not particularly limited, and can be pulverized and sized using, for example, a pulverizer such as a ball mill, a pin mill, or a vibration mill, and a commercially available classifier or sieve. The content of the Portland cement clinker pulverized product in the slag hydraulic composition is 20 to 100 parts by mass with respect to 100 parts by mass of the slag powder. If the amount is less than 20 parts by mass, the strength development is unlikely to be high even when a slag stimulant is used in combination, and neutralization is likely to occur. Moreover, when it exceeds 100 mass parts, chemical durability, such as alkali aggregate reaction, will fall, and also it will become impossible to reduce the amount of carbon dioxide discharged | emitted with hydraulic composition manufacture, and is unpreferable.
本発明の≡スラグ水硬性組成物に含有使用できるスラグ粉は、何れのスラグ粉でも使用することができる。具体例を示すと高炉スラグ、製鋼スラグ、下水汚泥溶融スラグ、ゴミ焼却灰溶融スラグ、脱珪スラグ、脱燐スラグ等を挙げることができる。好ましくは、比較的高い強度発現性が得られることから、高炉水砕スラグ粉を使用する。また、スラグ粉としての粒度は、比表面積が２０００〜１２０００ｃｍ2／ｇが好ましく、３０００〜１００００ｃｍ2／ｇがより好ましい。 Any slag powder can be used as the slag powder that can be used in the ≡slag hydraulic composition of the present invention. Specific examples include blast furnace slag, steelmaking slag, sewage sludge melting slag, refuse incineration ash melting slag, desiliconization slag, dephosphorization slag, and the like. Preferably, blast furnace granulated slag powder is used because relatively high strength development is obtained. Further, the particle size of the slag powder has a specific surface area preferably 2000~12000cm 2 / g, 3000~10000cm 2 / g is more preferable.
本発明の≡スラグ水硬性組成物には、前述の本発明の何れかのスラグ刺激剤をスラグ粉含有量１００質量部に対し、４〜１０質量部含有使用する。４質量部未満ではスラグ粉を十分刺激できないため、結合相形成に寄与されないスラグ粉が増大する結果、強度発現性の著しい低下が見られるので好ましくない。また、１０質量部を超える量では、石膏類の過剰配合となるため、低温時になるほどエトリンガイトの生成量が増え、過膨張を起こして、亀裂発生等により強度低下を起こし易いので好ましくない。 In the ≡slag hydraulic composition of the present invention, 4 to 10 parts by mass of any of the aforementioned slag stimulants of the present invention is used with respect to 100 parts by mass of slag powder. If the amount is less than 4 parts by mass, the slag powder cannot be sufficiently stimulated, so that the slag powder that does not contribute to the formation of the binder phase is increased. On the other hand, when the amount exceeds 10 parts by mass, the amount of gypsum is excessively mixed, so that the amount of ettringite increases as the temperature becomes lower, causing overexpansion and causing a decrease in strength due to cracking or the like, which is not preferable.
本発明の≡スラグ水硬性組成物は、前述のスラグ刺激剤、ポルトランドセメントクリンカ粉砕物及びスラグ粉以外の成分も、本発明の効果を実質的に喪失させない限り、含有することができる。含有可能な成分としては、例えば、各種骨材、減水剤類、凝結調整剤、消泡剤、撥水剤、白華防止剤、増粘剤、ポゾラン反応性物質、収縮低減剤、膨張材、セメント用ポリマー、繊維等を挙げることができる。このうち、骨材を使用する場合の含有量は、ポルトランドセメントクリンカ粉砕物及びスラグ粉の合計１００質量部に対し、およそ８００質量部以下が望ましい。これを超える量の骨材を使用すると強度が著しく低くなることがあるので適当ではない。 The ≡slag hydraulic composition of the present invention can contain components other than the slag stimulating agent, Portland cement clinker pulverized product, and slag powder as long as the effects of the present invention are not substantially lost. Examples of components that can be contained include various aggregates, water reducing agents, setting modifiers, antifoaming agents, water repellents, anti-whitening agents, thickeners, pozzolanic reactive substances, shrinkage reducing agents, expansion materials, Examples thereof include polymers for cement and fibers. Among these, when using an aggregate, the content is desirably about 800 parts by mass or less with respect to 100 parts by mass in total of the pulverized Portland cement clinker and the slag powder. Use of aggregates in excess of this is not suitable because the strength may be significantly reduced.
本発明の≡スラグ水硬性組成物は、前述のような成分を所定量秤量し、例えば、パン型、強制ニ軸、傾胴又はホバート等の混合機に、各成分を一括投入し、注水して混合することで得られる。また、予め水を加える前に各成分を適度に乾式混合し、これに任意の時点で注水し、混練して得られるものでも良い。また、本発明の≡スラグ水硬性組成物に加える水の量は、特に制限されない。推奨例を示すと、ポルトランドセメントクリンカ粉砕物及びスラグ粉の合計１００質量部に対し、２０〜８０質量部であれば、施工作業性等に支障を及ぼすことなく、またスラグ配合使用による強度発現性の低下を適度に抑制できるので好ましい。より好ましい水の配合量は、ポルトランドセメントクリンカ粉砕物とスラグ粉の合計１００質量部に対し、２５〜５５質量部とすることにより、例えば一般に高強度コンクリートとして知られている圧縮強度が４０Ｎ／ｍｍ2に達するような高強度の≡スラグ水硬性組成物を得ることが可能である。 The ≡ slag hydraulic composition of the present invention weighs a predetermined amount of the above-mentioned components, and, for example, puts each component into a mixer such as a pan mold, forced biaxial, tilting cylinder or Hobart, and pours water. Obtained by mixing. Moreover, before adding water previously, each component may be dry-mixed moderately, and water may be poured into this at an arbitrary point and kneaded. The amount of water added to the ≡slag hydraulic composition of the present invention is not particularly limited. When a recommended example is shown, if it is 20-80 mass parts with respect to a total of 100 mass parts of Portland cement clinker pulverized material and slag powder, it will not hinder construction workability, etc., and strength developability by using slag blending This is preferable because a decrease in the amount can be appropriately suppressed. More preferable water content is 25 to 55 parts by mass with respect to a total of 100 parts by mass of the Portland cement clinker pulverized product and slag powder, for example, a compressive strength generally known as high-strength concrete is 40 N / mm. It is possible to obtain a high-strength ≡slag hydraulic composition that reaches 2 .
以下、本発明を実施例によって具体的に説明するが、本発明は記載された実施例に限定されるものではない。 EXAMPLES Hereinafter, the present invention will be specifically described with reference to examples, but the present invention is not limited to the described examples.
［スラグ刺激剤の作製］
何れも市販試薬の、ＩＩ型無水石膏（ブレーン比表面積４８００ｃｍ2／ｇ）、α型半水石膏（ブレーン比表面積３５００ｃｍ2／ｇ）、β型半水石膏（ブレーン比表面積３８００ｃｍ2／ｇ）及び二水石膏（ブレーン比表面積３０００ｃｍ2／ｇ）から選定される石膏を単独又は２種以上の混合物として用い、次のＡ１〜Ａ１７で表すスラグ刺激剤とした。尚、２種以上の異なる石膏の混合物は、各石膏を所定量秤量し、これらをヘンシェル型混合機で約３分間混合した。
[Production of slag stimulant]
All of the commercially available reagents II type anhydrous gypsum (Blaine specific surface area 4800 cm 2 / g), α type hemihydrate gypsum (Blaine specific surface area 3500 cm 2 / g), β type hemihydrate gypsum (Brain specific surface area 3800 cm 2 / g) and Gypsum selected from dihydric gypsum (Brain specific surface area of 3000 cm 2 / g) was used alone or as a mixture of two or more to obtain slag stimulants represented by the following A1 to A17. In addition, the mixture of 2 or more types of different gypsum weighed a predetermined amount of each gypsum, and mixed these for about 3 minutes with the Henschel type mixer.
Ａ１；ＩＩ型無水石膏（単独）
Ａ２：ＩＩ型無水石膏３０質量部＋β型半水石膏５質量部
Ａ３；ＩＩ型無水石膏２５質量部＋β型半水石膏１０質量部
Ａ４；ＩＩ型無水石膏２０質量部＋β型半水石膏１５質量部
Ａ５；ＩＩ型無水石膏１５質量部＋β型半水石膏２０質量部
Ａ６；ＩＩ型無水石膏３０質量部＋β型半水石膏１０質量部
Ａ７；ＩＩ型無水石膏３０質量部＋β型半水石膏２０質量部
Ａ８；ＩＩ型無水石膏３０質量部＋β型半水石膏３０質量部
Ａ９；ＩＩ型無水石膏２０質量部＋β型半水石膏１０質量部
Ａ１０；ＩＩ型無水石膏１５質量部＋β型半水石膏５質量部
Ａ１１；ＩＩ型無水石膏２０質量部＋α型半水石膏１５質量部
Ａ１２；ＩＩ型無水石膏２０質量部＋α型半水石膏１質量部＋β型半水石膏１５質量部
Ａ１３；ＩＩ型無水石膏２０質量部＋β型半水石膏１５質量部＋ニ水石膏１質量部
Ａ１４；ＩＩ型無水石膏２０質量部＋ニ水石膏１５質量部
Ａ１５；α型半水石膏（単独）
Ａ１６；β型半水石膏（単独）
Ａ１７；ニ水石膏（単独）
A1; Type II anhydrous gypsum (single)
A2: Type II anhydrous gypsum 30 parts by mass + β type hemihydrate gypsum 5 parts by mass A3; Type II anhydrous gypsum 25 parts by mass + β type hemihydrate gypsum 10 parts by mass A4; Type II anhydrous gypsum 20 parts by mass + β type hemihydrate gypsum 15 parts by mass Part A5: Type II anhydrous gypsum 15 parts by mass + β type hemihydrate gypsum 20 parts by mass A6; Type II anhydrous gypsum 30 parts by mass + β type hemihydrate gypsum 10 parts by mass A7; Type II anhydrous gypsum 30 parts by mass + β type hemihydrate gypsum 20 Part A8; Type II anhydrous gypsum 30 parts by mass + β type hemihydrate gypsum 30 parts by mass A9; Type II anhydrous gypsum 20 parts by mass + β type hemihydrate gypsum 10 parts by mass A10; Type II anhydrous gypsum 15 parts by mass + β type hemihydrate gypsum 5 parts by mass A11; type II anhydrous gypsum 20 parts by mass + α type hemihydrate gypsum 15 parts by mass A12; type II anhydrous gypsum 20 parts by mass + α type hemihydrate gypsum 1 part by mass + β type hemihydrate gypsum 15 parts by mass A13; type II anhydrous 20 parts by mass of gypsum + 15 parts by mass of β-type hemihydrate gypsum Two water gypsum, 1 part by mass A14; II type anhydrous gypsum 20 parts by weight + two water gypsum 15 parts by weight A15; alpha-type hemihydrate gypsum (alone)
A16: β-type hemihydrate gypsum (single)
A17; dihydrate gypsum (single)
［プレミックスベースモルタルの作製］
ロータリーキルンで約１４５０℃で焼成して得たＪＩＳ Ｒ ５２１０の規定を充足する普通ポルトランドセメント用のクリンカを、５０℃以下になった時点で鋼製ボールミルで粉砕し、市販分級機を併用して、粒度がブレーン比表面積約３３００ｃｍ2／ｇの粉砕物を得た。該粉砕物１６９質量部と市販の高炉水砕スラグ粉（ブレーン比表面積約４１００ｃｍ2／ｇ）５７４質量部及び細骨材（ＪＩＳ Ｒ ５２０１「セメントの物理試験方法」で規定の「セメントの強さ試験用標準砂」に該当する細骨材）１３５０質量部をヘンシェル型混合機で３分間乾式混合し、プレミックスベースモルタルを作製した。
[Preparation of premix base mortar]
Clinker for ordinary Portland cement that satisfies the requirements of JIS R 5210 obtained by firing at about 1450 ° C. in a rotary kiln is pulverized with a steel ball mill when the temperature falls below 50 ° C., and a commercially available classifier is used in combination. A pulverized product having a grain size of about 3300 cm 2 / g of Blaine specific surface area was obtained. 169 parts by mass of the pulverized product, 574 parts by mass of granulated blast furnace slag powder (Brain specific surface area of about 4100 cm 2 / g) and fine aggregate (“Cement Strength” defined in JIS R 5201 “Physical Test Method for Cement” 1350 parts by mass of fine aggregate corresponding to “standard sand for test” was dry-mixed for 3 minutes with a Henschel mixer to prepare a premix base mortar.
［スラグ刺激剤の刺激作用の確認］
前記Ａ１〜Ａ１７で表されるスラグ刺激剤のスラグ粉刺激作用に対する評価として、作製したプレミックスベースモルタル２０９３質量部に対し、スラグ刺激剤Ａ１〜Ａ５、Ａ１１、Ａ１４〜Ａ１７についてはそれぞれ３５質量部を該モルタルに添加した。またスラグ刺激剤Ａ６については４０質量部を、スラグ刺激剤Ａ７については５０質量部を、スラグ刺激剤Ａ８については６０質量部を、スラグ刺激剤Ａ９については３０質量部を、スラグ刺激剤Ａ１０については２０質量部を、スラグ刺激剤Ａ１２とＡ１３については各３６質量部を、それぞれプレミックスベースモルタル２０９３質量部に対し添加した。何れの場合もプレミックスベースモルタルにスラグ刺激剤を加える際は、併せて水３３７質量部（プレミックスベースモルタル２０９３質量部に対する注水量）を加え、ホバート型混練機で約３分間常温環境下で混練を行い、モルタル（Ｂ１〜Ｂ１８）を作製した。次いでこのモルタルを、混練終了後直ちに、内寸で直径５０ｍｍ、高さ１００ｍｍの円柱形状の型枠に充填し、ＪＩＳ Ｒ ５２０１「セメントの物理試験」に準拠した方法で脱型及び養生を行い強度試験用供試体を作製した。材齢７日と２８日の供試体の圧縮強度をＪＩＳ Ｒ ５２０１「セメントの」物理試験に準拠した方法で測定した。その結果を表１に表す。
[Confirmation of stimulating action of slag stimulant]
As evaluation for the slag powder stimulating action of the slag stimulating agent represented by A1 to A17, 35 parts by mass for each of the slag stimulating agents A1 to A5, A11, and A14 to A17 with respect to 2093 parts by mass of the prepared premix base mortar. Was added to the mortar. Moreover, about 40 mass parts about slag stimulating agent A6, about 50 mass parts about slag stimulating agent A7, about 60 mass parts about slag stimulating agent A9, about 30 mass parts about slag stimulating agent A9, about about slag stimulating agent A10. Added 20 parts by mass, and for slag stimulants A12 and A13, 36 parts by mass were added to 2093 parts by mass of the premix base mortar, respectively. In any case, when adding the slag stimulating agent to the premix base mortar, add 337 parts by mass of water (the amount of water injected to 2093 parts by mass of the premix base mortar) and use a Hobart-type kneader in a room temperature environment for about 3 minutes. Kneading was performed to prepare mortars (B1 to B18). Next, immediately after the kneading is completed, the mortar is filled into a cylindrical mold having an internal size of 50 mm in diameter and 100 mm in height, and is demolded and cured by a method according to JIS R 5201 “Cement physical test”. Test specimens were prepared. The compressive strength of the specimens at 7 and 28 days of age was measured by a method based on the physical test of JIS R 5201 “cement”. The results are shown in Table 1.
［≡スラグ水硬性組成物の強度発現性］
さらに、前記のスラグ刺激剤Ａ４、前記と同様の普通ポルトランドセメント用のクリンカ粉砕物（ブレーン比表面積約３３００ｃｍ2／ｇ）、前記と同様の高炉水砕スラグ粉（ブレーン比表面積約４１００ｃｍ2／ｇ）、前記と同様の細骨材及び水から選定される材料を用い、表２に表す配合量となるようホバート型混合機に一括投入し、常温環境下で３分間混練して、水硬性組成物（Ｃ１〜Ｃ４）を作製した。また、スラグを含まずに、市販の普通ポルトランドセメントを使用した同様の水硬性組成物（Ｄ）も作製した。混練終了後の水硬性組成物は直ちに、内寸で直径５０ｍｍ、高さ１００ｍｍの円柱形状の型枠に充填し、ＪＩＳ Ｒ ５２０１「セメントの物理試験方法」に準拠した方法で脱型及び養生を行い強度試験用供試体を作製した。材齢７日と２８日の供試体の圧縮強度をＪＩＳ Ｒ ５２０１「セメントの物理試験方法」に準拠した方法で測定した。以上の結果を表２に記す。
[≡ Strength development of slag hydraulic composition]
Further, the slag stimulant A4, the same clinker pulverized product for ordinary Portland cement as described above (Brain specific surface area of about 3300 cm 2 / g), the same blast furnace granulated slag powder as described above (Brain specific surface area of about 4100 cm 2 / g) ), Using a material selected from the same fine aggregates and water as described above, and injecting into a Hobart mixer at the same time as shown in Table 2 and kneading for 3 minutes in a room temperature environment. The thing (C1-C4) was produced. Moreover, the same hydraulic composition (D) which does not contain slag and uses commercially available normal Portland cement was also produced. After completion of the kneading, the hydraulic composition is immediately filled into a cylindrical mold having an internal size of 50 mm in diameter and 100 mm in height, and demolding and curing are carried out by a method in accordance with JIS R 5201 “Physical Test Method for Cement”. A strength test specimen was prepared. The compressive strength of the specimens at the ages of 7 and 28 was measured by a method based on JIS R 5201 “Cement physical test method”. The above results are shown in Table 2.
表１の結果から、本発明のスラグ刺激剤を使用したスラグ粉含有モルタルは、注水初期から高い強度発現性が得られたことから、注水初期からスラグ粉が十分刺激され、セメント粒子と同様に水和反応活性が現れたことがわかる。また、表２の結果から≡スラグ含有量の水硬性組成物であっても、本発明のスラグ刺激剤を含むことによって材齢初期から長期に至るまで、水硬性物質が普通ポルトランドセメントのみからなる通常のモルタル質水硬性組成物と比べて遜色ない強度発現性を呈したことがわかる。 From the results in Table 1, the slag powder-containing mortar using the slag stimulating agent of the present invention obtained a high strength expression from the initial stage of water injection, so that the slag powder was sufficiently stimulated from the initial stage of water injection, similarly to the cement particles. It can be seen that hydration reaction activity appeared. Moreover, even if it is a hydraulic composition of ≡ slag content from the results of Table 2, the hydraulic substance is composed only of ordinary Portland cement from the early age to the long term by including the slag stimulating agent of the present invention. It can be seen that it exhibited a strength development comparable to that of a normal mortar hydraulic composition.
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| US20030167972A1 (en) * | 2000-10-05 | 2003-09-11 | Suz-Chung Ko | Slag cement |
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| JP2010285302A (en) * | 2009-06-09 | 2010-12-24 | Tokyo Institute Of Technology | Hydraulic cement composition |
| JP2011178604A (en) * | 2010-03-01 | 2011-09-15 | Taiheiyo Cement Corp | Cement-containing powder composition and hydraulic composition |
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| JPS56164047A (en) * | 1980-05-23 | 1981-12-16 | Yakult Honsha Kk | Manufacture of inorganic wall material |
| JPH0986978A (en) * | 1995-09-19 | 1997-03-31 | Denki Kagaku Kogyo Kk | Mixed cement composition |
| US20030167972A1 (en) * | 2000-10-05 | 2003-09-11 | Suz-Chung Ko | Slag cement |
| JP2010189219A (en) * | 2009-02-17 | 2010-09-02 | Utsunomiya Univ | Hydraulic composition and concrete using the hydraulic composition |
| JP2010285302A (en) * | 2009-06-09 | 2010-12-24 | Tokyo Institute Of Technology | Hydraulic cement composition |
| JP2011178604A (en) * | 2010-03-01 | 2011-09-15 | Taiheiyo Cement Corp | Cement-containing powder composition and hydraulic composition |
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